Central Corneal Thickness Measurements With Different Imaging Devices and Ultrasound Pachymetry

Abstract

CCT measurements between OLCR-UP and OLCR-Pentacam are comparable and can be used interchangeably in clinical practice. However, SM underestimates CCT compared with the other methods, whereas Pentacam was found to be the least repeatable and took the longest time.

Agreement between Central Corneal Thickness Measured Using Pentacam, Ultrasound Pachymetry, Specular Microscopy and Optic Biometer Lenstar LS 900 and the Influence of Intraocular Pressure

“…In spite of the amount of studies showing good correlation between UP and PC measurements, Tai et al [21] have claimed recently that the mean CCT by PC was 10 μm higher than that obtained using UP [10], which correlates well with our findings, showing significantly higher values in PC measurements.…”

“…This was also reported by previously publications. Tai et al [21], in a study of 184 eyes, also found close agreement between LE and UP. This statement agrees with another study by Beutelspacher et al [22], who compared CCT measures obtained with OCT, LE, PC and UP showing good agreement.…”

Central Corneal Thickness

“…Tai et al had reported that the mean CCT measurements by Pentacam HR were 10 μm more than that obtained using US pachymetry. 19 Other different studies also found that in Pentacam HR, CCT measurement to be thicker than ultrasound by 2.7 μm, and 6.4 μm, 8.0 μm, and 8.2 μm respectively 15,17,20,21 and in our study it was almost 5.346 um. Similarly, Hani et al concluded that Pentacam tends to overestimate CCT compared to US pachymetry in post Lasik patients.…”

Overview of Influence Factors on Corneal Thickness Measurement

“…Influence Factors: During the measurement, tear and eyelid will form a shelter to some extent (Tai et al, 2013); Due to its principle of optimal measurement, it is easy to be influenced by the transparency of cornea. Therefore, there are some requirements in symptoms of eye diseases for those under examination (Mencucci et al, 2012), such as caligo corneae and macular nebula.…”